For me, the most suffering moment of the film was the Jedi massacre in general, adn especially the moment where yoda feels it and suffers.
This scene was so academically perfect, my congratulations to george lucas.

Also, I felt really sad where sidious tells vader that padme is dead, and he says "nnooooo!"...

Definately Anakin burning. Mainly because of Obi-Wan's reaction. McGregor gave the performance of his life there! Is he a friend or a Sith Lord? Duty or frienship? As he looked away in sadness and disgust as his friend and learner burnt, I cried. It was BRILLIANT!!!

For me, the most suffering moment of the film was Padme's death and especially her last words : "There is still good inside him". That's reminds me Luke's efforts to bring his father back to the light side again, in RotJ.

I think that the most suffering moment for me was the death of Padme!And ofcourse the time when she was dying and she was asking if Anakin is ok,while Anakin was burning!And ofcourse Padme funeral!!Why you didn't put Padme's death on the poll my dear friend Talnistin?

It's a beutiful feeling to be united my friend by sharing our love for Star Wars,brother!!!!

Yasou ! It was a great film with so many wonderful parts... As to the suffering though i voted Padme, the terrible shock of the yougnlings as they ran towards Anakin and then the moment he began to swing his light saber, wow.